Mercurial > hg > xmms-sid
annotate src/xs_stil.c @ 101:4614f58ab169 dev-0_8_0b6
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author | Matti Hamalainen <ccr@tnsp.org> |
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date | Sun, 11 Jan 2004 01:25:01 +0000 |
parents | 2bc56809ec0b |
children | fe83646e6baa |
rev | line source |
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1 | 1 /* |
2 xmms-sid - SIDPlay input plugin for X MultiMedia System (XMMS) | |
3 | |
4 STIL-database parsing functions | |
5 | |
40 | 6 Mostly written by Matti "ccr" Hamalainen <ccr@tnsp.org>, |
1 | 7 some parts written by Willem Monsuwe <willem@stack.nl> |
8 | |
9 This program is free software; you can redistribute it and/or modify | |
10 it under the terms of the GNU General Public License as published by | |
11 the Free Software Foundation; either version 2 of the License, or | |
12 (at your option) any later version. | |
13 | |
14 This program is distributed in the hope that it will be useful, | |
15 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 GNU General Public License for more details. | |
18 | |
19 You should have received a copy of the GNU General Public License | |
20 along with this program; if not, write to the Free Software | |
21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
22 */ | |
23 | |
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24 #include "xs_stil.h" |
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25 #include "xs_support.h" |
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26 #include "xs_config.h" |
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27 #include <stdlib.h> |
1 | 28 #include <stdio.h> |
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29 #include <ctype.h> |
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30 #include <string.h> |
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31 |
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32 /* |
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33 * Pointer to database in memory |
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34 */ |
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35 static t_xs_stil_node *xs_stildb = NULL; |
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36 static t_xs_stil_node **xs_stildbi = NULL; |
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37 static gint xs_stildbn = 0; |
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38 |
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39 |
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40 /* |
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41 * Hash-database handling functions |
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42 */ |
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43 t_xs_stil_node *xs_stildb_node_new(void) |
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44 { |
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45 t_xs_stil_node *pResult; |
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46 |
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47 /* Allocate memory for new node */ |
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48 pResult = (t_xs_stil_node *) g_malloc0(sizeof(t_xs_stil_node)); |
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49 if (!pResult) return NULL; |
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50 |
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51 return pResult; |
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52 } |
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53 |
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54 |
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55 void xs_stildb_node_free(t_xs_stil_node *pNode) |
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56 { |
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57 gint i; |
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58 |
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59 if (pNode) |
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60 { |
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61 for (i = 0; i < pNode->nsubTunes; i++) |
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62 { |
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63 g_free(pNode->subTune[i].pName); |
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64 g_free(pNode->subTune[i].pTitle); |
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65 g_free(pNode->subTune[i].pArtist); |
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66 g_free(pNode->subTune[i].pComment); |
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67 } |
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68 |
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69 g_free(pNode->pcFilename); |
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70 g_free(pNode); |
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71 } |
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72 } |
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73 |
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74 |
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75 /* |
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76 * Insert given node to db linked list |
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77 */ |
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78 #define LPREV (pNode->pPrev) |
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79 #define LTHIS (pNode) |
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80 #define LNEXT (pNode->pNext) |
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81 |
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82 void xs_stildb_node_insert(t_xs_stil_node *pNode) |
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83 { |
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84 if (xs_stildb) |
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85 { |
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86 /* The first node's pPrev points to last node */ |
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87 LPREV = xs_stildb->pPrev; /* New node's prev = Previous last node */ |
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88 xs_stildb->pPrev->pNext = pNode; /* Previous last node's next = New node */ |
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89 xs_stildb->pPrev = pNode; /* New last node = New node */ |
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90 LNEXT = NULL; /* But next is NULL! */ |
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91 } else { |
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92 xs_stildb = pNode; /* First node ... */ |
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93 LPREV = pNode; /* ... it's also last */ |
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94 LNEXT = NULL; /* But next is NULL! */ |
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95 } |
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96 } |
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97 |
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98 |
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99 /* |
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100 * Get STIL information from database |
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101 */ |
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102 t_xs_stil_node * xs_stildb_get(gchar *pcFilename) |
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103 { |
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104 gint iStartNode, iEndNode, iQNode, r, i; |
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105 gboolean iFound; |
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106 t_xs_stil_node *pResult; |
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107 |
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108 /* Check the database pointers */ |
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109 if (!xs_stildb || !xs_stildbi) |
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110 return NULL; |
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111 |
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112 /* Look-up via index using binary search */ |
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113 pResult = NULL; |
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114 iStartNode = 0; |
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115 iEndNode = (xs_stildbn - 1); |
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116 iQNode = (iEndNode / 2); |
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117 iFound = FALSE; |
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118 |
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119 while ((!iFound) && ((iEndNode - iStartNode) > 128)) |
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120 { |
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121 r = strcmp(pcFilename, xs_stildbi[iQNode]->pcFilename); |
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122 if (r < 0) |
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123 { |
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124 /* Hash was in the <- LEFT side */ |
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125 iEndNode = iQNode; |
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126 iQNode = iStartNode + ((iEndNode - iStartNode) / 2); |
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127 } else |
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128 if (r > 0) |
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129 { |
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130 /* Hash was in the RIGHT -> side */ |
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131 iStartNode = iQNode; |
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132 iQNode = iStartNode + ((iEndNode - iStartNode) / 2); |
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133 } else |
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134 iFound = TRUE; |
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135 } |
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136 |
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137 /* If not found already */ |
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138 if (!iFound) |
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139 { |
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140 /* Search the are linearly */ |
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141 iFound = FALSE; |
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142 i = iStartNode; |
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143 while ((i <= iEndNode) && (!iFound)) |
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144 { |
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145 if (strcmp(pcFilename, xs_stildbi[iQNode]->pcFilename) == 0) |
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146 iFound = TRUE; |
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147 else |
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148 i++; |
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149 } |
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150 |
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151 /* Check the result */ |
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152 if (iFound) |
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153 pResult = xs_stildbi[i]; |
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154 |
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155 } else { |
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156 /* Found via binary search */ |
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157 pResult = xs_stildbi[iQNode]; |
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158 } |
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159 |
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160 |
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161 return pResult; |
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162 } |
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163 |
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164 |
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165 /* |
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166 * Read database to memory |
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167 */ |
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168 gint xs_stildb_read(gchar *dbFilename) |
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169 { |
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170 FILE *inFile; |
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171 gchar inLine[XS_BUFSIZE]; |
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172 guint lineNum, linePos; |
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173 gboolean iOK; |
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174 t_xs_stil_node *tmpNode; |
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175 |
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176 /* Try to open the file */ |
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177 if ((inFile = fopen(dbFilename, "ra")) == NULL) |
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178 { |
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179 XSERR("Could not open STILDB '%s'\n", dbFilename); |
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180 return -1; |
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181 } |
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182 |
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183 /* Read and parse the data */ |
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184 lineNum = 0; |
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185 |
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186 while (!feof(inFile)) |
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187 { |
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188 fgets(inLine, sizeof(inLine), inFile); |
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189 lineNum++; |
101 | 190 |
191 | |
192 | |
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193 } /* while */ |
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194 |
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195 /* Close the file */ |
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196 fclose(inFile); |
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197 return 0; |
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198 } |
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199 |
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200 |
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201 /* |
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202 * Compare two nodes' hashes |
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203 */ |
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204 gint xs_stildb_cmp(const void *pNode1, const void *pNode2) |
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205 { |
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206 /* We assume here that we never ever get NULL-pointers or similar */ |
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207 return strcmp((*(t_xs_stil_node **) pNode1)->pcFilename, |
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208 (*(t_xs_stil_node **) pNode2)->pcFilename); |
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209 } |
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210 |
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211 |
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212 /* |
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213 * Initialize the song-length system |
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214 */ |
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215 gint xs_stil_init(void) |
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216 { |
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217 t_xs_stil_node *pCurr; |
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218 gint i; |
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219 |
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220 XSDEBUG("stil_init()\n"); |
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221 |
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222 /* Read the database */ |
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223 if (!xs_cfg.stilDBPath) |
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224 return -10; |
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225 |
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226 if (xs_stildb_read(xs_cfg.stilDBPath) < 0) |
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227 return -9; |
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228 |
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229 XSDEBUG("indexing...\n"); |
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230 |
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231 /* Get size of db */ |
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232 pCurr = xs_stildb; |
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233 xs_stildbn = 0; |
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234 while (pCurr) |
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235 { |
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236 xs_stildbn++; |
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237 pCurr = pCurr->pNext; |
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238 } |
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239 |
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240 /* Check number of nodes */ |
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241 if (xs_stildbn > 0) |
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242 { |
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243 /* Allocate memory for index-table */ |
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244 xs_stildbi = (t_xs_stil_node **) g_malloc(sizeof(t_xs_stil_node *) * xs_stildbn); |
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245 if (!xs_stildbi) return -6; |
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246 |
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247 /* Get node-pointers to table */ |
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248 i = 0; |
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249 pCurr = xs_stildb; |
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250 while (pCurr) |
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251 { |
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252 xs_stildbi[i++] = pCurr; |
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253 pCurr = pCurr->pNext; |
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254 } |
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255 |
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256 /* Sort the indexes */ |
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257 qsort(xs_stildbi, xs_stildbn, sizeof(t_xs_stil_node *), xs_stildb_cmp); |
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258 } |
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259 |
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260 /* OK */ |
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261 XSDEBUG("init ok.\n"); |
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262 return 0; |
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263 } |
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264 |
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265 |
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266 /* |
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267 * Close song-length system |
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268 */ |
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269 void xs_stil_close(void) |
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270 { |
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271 t_xs_stil_node *pCurr, *pNext; |
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272 |
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273 /* Free the memory allocated for database */ |
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274 XSDEBUG("stildb_close()\n"); |
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275 pCurr = xs_stildb; |
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276 while (pCurr) |
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277 { |
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278 pNext = pCurr->pNext; |
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279 xs_stildb_node_free(pCurr); |
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280 pCurr = pNext; |
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281 } |
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282 |
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283 xs_stildb = NULL; |
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284 |
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285 /* Free memory allocated for indexes */ |
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286 if (xs_stildbi) |
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287 { |
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288 g_free(xs_stildbi); |
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289 xs_stildbi = NULL; |
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290 } |
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291 } |
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292 |
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293 |
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294 /* |
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295 * Get STIL information |
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296 */ |
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297 t_xs_stil_node * xs_stil_get(gchar *pcFilename) |
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298 { |
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299 t_xs_stil_node *pResult; |
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300 |
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301 return pResult; |
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302 } |